This game is somewhere around one decade old now and the players have long understood the irritating costs to play "actively" and the reasons why many new players drop out early. The game has improved and changed dramatically since its beginning, but there are still problems that many fear will persist for many years to come. Those who love this game have learned to adapt, but there is a steep learning curve for new players. (Even with the recent newbie experience upgrades). The players have yelled at
MA for years, offering various solutions to their problems, but
MA often fails to listen.
MA (MindArk) original creator of the game platform and technically the owner of Calypso even though they also technically aren't.
MA has been more communicative in recent months and they appear to have attempted to be more communicative like the much more appreciated Arkadian development team. But, since the game runs on real money it is difficult to encorporate new ideas. While the game can be free to play (I am a good example of a freeplayer) in order to truly be active, activity and skill wise, you do need to pay a lot to play. However, you can and many do find a middle-ground where they end up paying, as you said, what a normal MMO fee would be. The trick is to play smart, be careful with your money, go slow, and be as eco as possible which includes trying to get as much Mark-Up for items as you can.
As far as the kill quests go; there are 2 main types of quests in this game.
1) Story-line quests which often feature some sort of story-line along with doing various activities such as find this area, interact with this object, kill this many of this type of mob. These quests require you to kill considerably less mobs than the other type of quest. Often varrying around 20-200.
2) Iron/hunting challenges. These are the quests that will require you to kill a vast amount of mobs to complete. They are seen more as "goal" quests rather than "completion" quests. Meaning that they are used as long term goals to achieve rather than quick story-lines that you want to advance in as fast as possible. The amount of mobs varies by palnet; I know that Arkadian Iron challenges require you to kill less mobs than Calypso ones; but they will commonly ask you to kill around 500 mobs for the first mission, then 1,000, then 5,000, and finally 10,000 after which you will enter the bronze mission challenges which are basically the same thing except with higher level maturity mobs.
There are also 2 types of secondary quests.
1) More recently the planet partners have begun adding "instances". These are like arena style quests where you enter an area and follow through with the instructions until the end. Sometimes they feature a story-line, sometimes they don't. Sometimes they require you to complete the instance before you are allowed to leave, sometimes they don't. Sometimes they have a timer, sometimes they don't. Examples of these quests include: Arkadian Key quests, Robot Beacons (on Calypso), and The Fire-Wall (On Rocktropia).
2) Random little quests here and there that you come upon that don't really have much of a story-line and or isn't an iron challenge or instance.